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KMID : 1025520120540040267
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Journal of Animal Science and Technology
2012 Volume.54 No. 4 p.267 ~ p.274
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Genotype Frequencies of the Sex-Linked Feathering and Their Phenotypes in Domestic Chicken Breeds for the Establishment of Auto-Sexing Strains
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Sohn Sea-Hwan
Park Dhan-Bee
Song Hae-Ran
Cho Eun-Jung
Kang Bo-Suk
Seo Ok-Suk
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Abstract
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The method of sexing based on differences in the rate of feather growth provides a convenient and inexpensive approach. The locus of feather development gene(K) is located on the Z chromosome and can be utilized to produce phenotypes that distinguish between the sexes of chicks at hatching. To establish the auto-sexing native chicken strains, this study analyzed the genotype frequency of the feathering in domestic chicken breeds. The method of classification of slow- and rapid-feathering chickens was also investigated. In the slow-feathering chicks, the coverts were either the same length or longer than the primary wing feathers at hatching. However, the rapid-feathering chicks had the primary wing feathers that were longer than the coverts. The growth pattern of tail feather also distinctively differed between the rapid- and slow-feathering chicks after 5-days. The accuracy of wing feather sexing was about 98% compared with tail sexing. In domestic chicken breeds, Korean Black Cornish, Korean Rhode Island Red, and Korean Native Chicken-Red had both dominant(K) and recessive(k+) feathering genes. The other breeds of chickens, Korean Brown Cornish, Ogol, White Leghorn, Korean Native Chicken-Yellow, -Gray, -White and -Black had only the recessive feathering gene(k+). Consequently, feather sexing is available using the domestic chicken breeds. Establishing the maternal stock with dominant gene(K-) and paternal stock with recessive gene (k+k+), the slow-feathering characteristic is passed from mothers to their sons, and the rapid-feathering characteristic is inherited by daughters from their fathers.
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KEYWORD
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Feather sexing, Sex-linked inheritance, Slow-feathering gene (K), Genotype frequency, Korean Native Chicken
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